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Unformatted text preview: Why not C = E(E(P,K 1 ),K 2 ) ? A (semi-practical) known plaintext attack Precompute table of E(P,K 1 ) for every possible key K 1 (resulting table has 2 56 entries) Then for each possible K 2 compute D(C,K 2 ) until a match in table is found When match is found, have E(P,K 1 ) = D(C,K 2 ) Result is keys: C = E(E(P,K 1 ),K 2 ) 3DES...
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- Fall '10
- Information Security, Data Encryption Standard, Triple DES, possible K2 compute